The invention concerns a security document comprising a transparent window in which a first optical element is arranged and a second transparent window in which a second optical element is arranged. The adrenoceptors have important roles in regulating a myriad of physiological conditions and their malfunction has been implicated in the pathophysiology of a number of diseases. A connector pin longitudinally extends through the housing and is rotatable relative thereto among selectively variable rotational orientations in which the pin is releasably locked to the housing by cooperative detent structures carried by the housing and the pin. After the power is turned off, it can store data in the non-volatile memory unit, so that the data can be automatically restored to the static random access unit from the non-volatile memory unit when the power is turned on.